I am having this exact problem. The thing is if you raise the chain then go down the conveyer belt and then get off it, and reverse the direction of the belt, (so that its going down) you can't get back to the crane anymore. If you try to run up the slopped part of the belt and out the water Manny just automatically jumps off the belt at the lever. And of course if you have the chain lowered you can't get to the lever because the belt is moving up. This is really frustrating me.